Lepidoptera 13 i 
Oeneis semidea Say. 
Hipparchia semidea Say: Am. Ent., Ill, pi. 50, 1828. 
In the Canadian National collection there are thirteen specimens of Oeneis 
from the Yukon Territory which I have compared with semidea from New 
Hampshire, and from which they do not differ in characters which seem to me 
to be important. The genitalia, also, are very close to those of specimens from 
Mount Washington, New Hampshire, as will be seen by comparing the figures 
on Plate I, figs. 2 and 3. The underside of these specimens is in general very 
similar to Edwards' figure 2^ The females are large, expanding 51-53 mm. 
The males, excepting one specimen, expand 44-47 mm. the exception having a 
wing expanse of 53 mm. 
These specimens are from the following localities: Mountain 6,500 feet 
above Wolf canyon, Pelly river, Yukon Territory, July 17, 1907, 2 males (J. 
Keele); Pelly river at Hoole canyon, Yukon Territory, July 30, 1907, male 
(J. Keele) ; Stewart river, Yukon Territory, 4,000 feet above valley, July 18, 
1905, male (J. Keele) ; Mountain top, above Nadaleen river, Yukon Territory, 
July 10, 1905, male (J. Keele); Mountain near Upper Pelly river, Yukon Terri- 
tory, July 13, 1907, female (J. Keele); Orange creek, Yukon Territory, lat. 66° 
10', international boundary, June 27, 1912, 2 females (D. D. Cairnes); Eduni 
mountain, 4,500-6,000 feet, Gravel river, Northwest Territories, July 5, 8, 1908, 
1 male, 3 females (J. Keele) ; Gravel river, mountain below Natla river. North- 
west Territories, July 2, 1908, female (J. Keele). 
The underside of two males, one from Pelly river, Yukon Territory, the other 
from Gravel river, Northwest Territories, together with a female from Orange 
creek, Yukon Territory, are shown on Plate II, figs, 1, 2 and 3. 
Oeneis semidea var. arctica, new variety 
Differs from semidea from New Hampshire in the general colour of both the 
upperside and the underside of the wings." The upper side of the wings is pale 
brown, almost drab-, the dark scales of the underside showing through particu- 
larly on the secondaries. The underside is of a dull grey-brown, the maculation 
dark brown and not nearly so contrasting with the ground colour as in semidea, 
the mottlings being much more diffused and there being an absence of the con- 
spicuous whitish areas present in the latter on the underside of the secondaries, 
The basal area to anal angle is noticeably darkest, inclining to blackish. Fringes 
whitish, weakly checkered with brown. 
Alar expanse, 41 mm. 
Tvpe, a male, in the Canadian National collection from Bernard harbour. 
Northwest Territories, July, 1916 (F. Johansen). (PI. IV, fig. 4.) Four male 
paratypes from the same locality and bearing the same data are in general 
similar, with wing expanse of 37-38 mm. In addition to the five males there 
are four females which we are placing tentatively with this new variety. Three 
of these are from Wollaston Land, Victoria island, 1915 (D. Jenness) ; the fourth 
is from Bernard harbour, Northwest Territories, July, 1915 (F. Johansen). In 
these females there is an absence of the black suffusion of the basal area. They 
have a wing expanse of 41-42 mm. The underside of one of the male paratypes 
is shown on PI. II, fig. 4. 
The claspers of semidea aretica are shown on PI. I, fig. 4 beside those of 
semidea from New Hampshire. It will be seen that they are very close to those 
of the latter. The general colour of the arctic specimens as well as the nature 
of the maculation on the underside of the secondaries, and their smaller wing 
expanse seem to warrant the naming of this variety or race. 
iButt. of N.A., Chionobas, IX, f. 2. 
^Ridgway's Color Standards and Nomenclature, 1912. 
